Lag on X1's HDMI input is barely noticeable.

[SvennoJ]

niallyb said:
If its perceptible at all by a human then 2 things automatically follow:

a:) Its unsuitable as an AV input because the output sound and video will inevitably fall out of phase without some form of correction.

b:) Its unsuitable as an input for any game where reaction speed and timing are important , such as platformers , FPS or sports games.

a) Since it's hdmi, I would assume the audio is synched. HDMI audio synch has been around since version 1.3
    (Otherwise those 120hz smooth motion tv's with upto 150ms delay would never work)
b) definitely